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Which of the following rules assigns a real value to every real number \(x\)?

Answer and explanation

Correct answer: \(x^2\)

\(x^2\) is defined and real for every real \(x\). In contrast, \(\sqrt{x}\) needs \(x\geq0\), and \(1/x\) is undefined at \(x=0\). Exam tip: first check the radicand and any denominator when identifying domains.

Related tags

Real Valued FunctionsDomain And RangeRelations And FunctionsClass 11 MathematicsTheir Domain And RangeReal Valued Functions Their Domain And RangeMathematicsClass 11 Mcq

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